Self-oiling head motion



Dem 1,1925.

c. E. THOMPSON SELF OILINQ HEAD IOTION 10 sham-SW 1 Filed lay 15. 1919 Dec. 1, 1925- 1.5646151 -C E. THOMPSON SELF OILING HEAD MOTION Filed May 15. 1919 10 Sheets-Sheet 2 C. E. THOMPSON SELF OILING HEAD MOTION Dec. 1, 1925, 1.564.151

Filed May 15. 1919 10 Sheets-Sheet 5 c. E. THOMPSON s'su" 01mm HEAD mm 10 Sheets-Sheet 4 Filed May 15. 1919 .Dec. 1, 1925. 1.564.151

C. E. THOMPSON SELF OILING HEAD MOTION Filed May 15. 1919 10 Sheets-Sheet s DOC. 1 1925- C. E. THOMPSON ,sBLF 01mm HEAD 11011011 Filed May -15. 1919 10 She'ets-Sheet 6 (L i fitter/nu,

Dec. 1, 1925- C. E. THOMPSON SELF OILING HEAD MOTION Filed Ma 1 5. 1919 -;10 Sheets-Sheet 7 I N" v 2 n i can a N g m I m z n f .s' l Qhtmmo Dec.1,1925- 1.564.151

C. E. THOMPSON SELF OILING HEAD MOTION Y 10 Sheets-Sheet 8 Filed May 15, 1919 Decw 1, W25- 1.564.151

c E. THOMPSON SELF OILING HEAD MOTION Filed May 15, 1919 10 Sheets-Sheet l0 EQUAL /NTL'RVAL$ OF RorAr/a/v QQQGGQRG-KGRSONQQG1QWN-Q b COMPLETE (Ya I2Il/0987654-32/0 EQUAL 7NTERVAL5 0F 571mm:

wane/so Q Patented Dec. 1, 1925.

UNITED STATES PATENT OFFEGE.

CHARLES E. THOMPSON, 01? DENVER, COLORADO, .ASSIGNOR' 'BO-THE MINE &' SHELTER SUPPLY COMPANY, OF DENVER, COLORADO, A CORPORATION OF COLORADO.

SELF-OILING HEAD MOTION.

Application filed May 15, I919. Serial No. 297,197.

To all wiiom'it may. concern:

Be it known that 1, CHARLES: E. THOMP- SON, a citizen of the United States, residing at the city and county of Denver and State of Colorado, have invented certain new and useful Improvements in Self-Oiling Head Motions, of which the following is a specification.

My invention relates to an improvement in in self-oiling head motions.

The primary object of this invention is to provide a self-oiling head motion which will produce a longuseful pause at the end of" the return stroke which is soess'e'ntial for the settling of the mineral, thus assisting to make the art of concentration more eflici'ent The invention further consists in anoil seal ring on the eccentric shall.- at the end of the open. hearing.

The invention likewise consists in mechanism. for creatinga: distinct pause or stop which occurs at the end of tlie' stroke, (this pauseor stop not being a mere changeof dimotion). during which time the material is givenopportunity to settle definitely'be'fore being again thrown into action, and it prevents the back lash or wash produced by other motions which keep the material in almost constant agitation;

This present invention further consists in toggles placed above the eccentric shaft, as distinguished from other forms of head motion toggles which have been below the eccentric shaft.

It further consists in a pitman having an open side, so that the pitina-n cap can be easily removed; and athrust-yoke of improved design, and with thrust-guides or bearings which are more easily adjusted than other thrust yokes and bearings.

In the accompanying drawings Fig. 1' is a plan view showing a' concentrator of the Wilfley type with my improved self-oiling head motion in. position;

Fig. 2 is a longitudinal sectional view;

Fig. 2""is a top plan view with the cover removed;

Fig. 3 is a rear end elevation;

' Fig. l is a front end elevation";

Fig. 5 is a sectional view in detail of the pitman; I

Fig; 6 is a front elevation ofthe same;

Fig. 7 is a view of the eccentric shaft; I Fig. 8 shows one of the lower guides;

Fig. 9 is a plan view of the upper guideshoe;

Fig. 9 is a side View of the same;

Fig. l O'is' a plan view ofthe upper guide retainer; I

Fig. 10 is a vertical longitudinal section through the same;

Fig. 11 is plan view of the adjusting toggle-seat Fig. 11f is a side elevation of the 's'ame;

Figs. 12 and12 are views'iof'the toggle;

Figs; 13 and 13*" are views of the pitman cap;

is an inner endelevation of the closed shaft bearing;

Fig. 15- is a vertical longitudinal section of the same;

Fig. 16' is' an outer end elevation of the open shaft bearing;

Fig. 17 is a section of the same;

Fig. 1 8" is an inner end elevation of the same;

Fig; 19 is a view in side elevation ant-1 in section of the oil ring seal;

Figs. 20,121 and" 22 are diagrams as'fol- 1owsFig. 20" shows motionilay-out of midposition of the head motion, Fig. 21' shows lay-out for the maximum throw of the mo tion, and is" obtained when the adjustable toggle-seat has been lowered about one-half inch below the position shown in Fig. 20'; Fig. 22 shows a similar lay-out for maximum' throw, and in this view the toggle seat has been raised one-halfinch above the position shown in Fig. 20';

Fig. 23 shows the trace or card that is obtained from table decks actuated by this motion.

The head motion is' entirely enclosed in an oil. tight case 1', having'a' cover 1. The lubrication is eiie'cted' by the splash system produced by the rapid revolving of the cocentric shaft 2' and pitinan 3, which dip into the oil in the reservoir, causing the oil to splash overand on to'the rapidly moving parts of the head motion-which are enclosed.

The stroke is adjustable from the maximum to the minimum lengthby means of a stroke adjusting screw 4" attached to the adjusting toggle-seat 5, which may be iowcred or raised to give the desired length of stroke to the table deck, and can also be locked in position by means of a set-screw.

The horizontal thrust yoke 6 is supported between the lower guide 7 and the upper guide-retainer 7 to the side of the case. This lower guide and upper guide retainer keep the yoke level and moving in a straight line, and the upper guide retainer has an adjustable shoe 8 which is easily renewed and handy to adjust.

The pitman 3 is made with an open side through which the pitman-cap 9 can be easi ly and conveniently removed without taking out the main eccentric shaft from its bearings, a set-screw 10 adjusting and holding the pitman-cap 9 in place when in operation.

The closed and open shaft bearings 11 and 12 have adjustable shaft bearing caps 13 which are adjusted by set-screws 1 1, one shaft bearing having the closed shaft bearing 11, while the other end and drive pulley side rotates in the open shaft bearing 12 and is provided with an oil seal ring 15 around the shaft on the inside of the outer edge of the bearing. This ring diverts the oil (which comes to the outer edge of the hearing) through an oil-way back to the main oil reservoir.

The shaft bearing end cap 23 receives the eccentric shaft 2 therethrough, and it is bolted on the outer end of the open shaft bearing 12, forming an oil-tight closure for the same.

The proper tension of the heavy coilspring 16 whose purpose it is to keep the toggles 17 in proper position in their seats and to maintain all working parts in proper unison, takes care of all working shock. The tension of the spring is maintained at a tension just enough to keep working parts from knocking (too much tension will cause working parts to knock). One end of this coil-spring 16 bears against the yoke 6, and the other end rests in the rear spring washer 22, and an adjusting screw 23 threaded into the end of the main casing 1 is set to regulate the tension of the coil-spring 16, and the locking-nut 24 holds the adj Listing-screw 23 in its adjusted position.

The tight and loose pulleys 18 and 19 may be installed and operated on either side of the head motion by reversing the drive shaft and changing shaft bearings to desired side. The rotation of drive-shaft can be clockwise or counter clock-wise. The loose pulley 19 is provided with a renewable bushing 20, around which is an oil receptacle in the hub and around the bushing which is filled with oiled waste making the loose pulley selfoiling.

The following is a detailed description of the differential motion obtained by the combination of an eccentric shaft 2, a pitnian 3, toggles 17 adjusting toggle-seat 5, toggleseat 21, and the thrust-yoke 6, as shown on the assembled drawing and as laid out in diagrams in Figs. 20, 21 and 22.

Mid position described.

In Fig. 20, positions of the various parts are referred to by number, such as eccentric shaft 2, etc. When adjusting toggle-seat 5 is in the mid position M and toggles 17 have positions M M and M M pitman 8 has position AM M Eccentric shaft 2 is then at the top position 0 shown on the eccentric circle AB, also the toggle-seat 21 in yoke 6 is in position M This position just described and located by letters is the beginning of the return stroke.

Return stroke desorbed.

An eccentric shaft 2 moves through the successive points 1, 2, 3, 1, 5, 6, etc., it is shown that adjustable toggle-seat 5 remains in the position M That the pitina-n 3 at tached to the eccentric shaft 2 moves the ends of the toggles 17 through the different positions shown as a curved line 1 2 N and an ellipse M N This motion of toggles as they straighten out causes the toggle-seat 21 and yoke 6 to move from the position M towards N*.

This movement is further described as follows: During an interval of rotation that it takes the eccentric shaft 2 to turn from position 0 to position 6 on the eccentric circle AB which is 90, or onefourth of a revolution, the thrust-yoke 6 has been caused to travel nearly three-fourths of the distance between M and N. This is a quick return of more velocity than would be obtained by what is known as simple harmonic motion (simple harmonic motion as here referred to is a straight line projection on the diameter of the successive points around the eccentric circle). As we continue to examine the travel around the eccentric circle AB, it is seen that from point 6 to 12, which is one-fourth of a revolution, the thrust yoke 6 travels the remaining fourth of the backward stroke distance to position N This is really a quick retard of 50% less velocity than simple harmonic motion. As the eccentric shaft continues to turn from point 10 to 15, the thrust yoke is practically at a pause before starting in the reverse direction which is the forward stroke.

Forward stroke described.

With the slight pause noted above, the thrust yoke will reach a position of approximately one-fourth of the forward stroke distance in the interval of rotation that eccentric shaft 2 has turned to point 18, which is a total of three-fourths of a revolution. Again as we examine the straight line velocity, it will be seen that it will be 50% slower than simple harmonic motion. As the eccentric shaft 2 moves from point 18 to O and completes a total revolution, the thrust yoke 6 moves the remaining threefourths of the forward stroke to M, and again it will be seen that this is faster than simple harmonic motion. Therefore, as seen above, we may sum up and describe the motion as follows :A quick return, slowing up, pause, slow forward increasing to high velocity and turn.

Maximum throw described in Fig. 21.

As shown the position of the various parts mentioned when a maximum throw or movement is desired at the beginning of the return stroke, the adjusting toggle-seat 5 which has been lowered onehalf inch from the position shown in Fig. 1 to position C shown in Fig. 2. This causes toggles 17 to take a slightly different position than they occupied in Fig. 1. This new position is shown by C C and C C, also the pitman 3 has taken the position AC C and the toggle-seat 21 and thrust yoke 6 is in position 1 which is slightly forward of po sition shown in Fig. 1.

This position may be described again as follows: Pitman more nearly in vertical line,

toggles at a less angle, and thrust yoke sli 'htly forward.

o carefully are the parts designed and located, that their position must be carefully planned. It is to be noted that the aitman must not pass very far to the right of the vertical line XX. Should this line he excessively crossed, the motion at the end of the return stroke instead of having a pause would have a slight reverse kick. Fig.,2 may be examined through successive intervals of motion similar to that which has already been described under Fig. 1.

illt'm'mmn throw described in Fig. 22.

Fig. 22 has been prepared to show the adjustable toggle-seat 5 raised to a position one-half inch above mid-position l 1 shown in Fig. 1. A ain the initial positions have this shorter stroke length as shown by position A A B A B A and description of successive points through which these pass to be similar to descriptions given under heads, Mid position and maximum position described.

From the foregoing descriptions, it is readily seen that as the adjusting toggle-seat 5 is lowered the stroke given by the thrustyoke 6 is lengthened, and by raising the adjustable toggle-seat, the length of stroke is shortened. The design is so carefully planned that the position of toggle-seat 5 when raised to its highest position is not above the straight line drawn through E B and continued on to approximately A If A were raised much beyond this straight line B B A then a kick or counter-jerk would be noted at the end of the return stroke.

In the above description, it has been intended to show the care with which this design has been developed so as to obtain a quick return, slowing up, pause slow forward increasing to high velocity and stop; therefore, the design as perfected and described is a means to obtain this useful clifferential motion to concentrating tables.

In Fig. 23 is shown the trace or card that is obtained from table decks actuated by the enclosed self-oiling head motion. This card istaken for the mid-position shown in Fig. 1 and other cards for maximum or minimum positions would be similar, only stroke longer or shorter.

lhe purpose of this card is to show clearly every point previously described, and is especially made to show what is meant by the word pause which is different from stop or turning point. The length of this pause is about 35 of eccentric turning. This pause is a new and important and very useful feature. It serves the purpose of allowing the heavier mineral on table deck to settle in contact with the table before being thrown forward. The differential as described carries mineral along the table deck.

I claim:

1. A head motion comprising a thrustyoke, upper and lower thrust-guides, adjustable guide retainers, an eccentric shaft arranged below the thrust-yoke, a vertically adjustable toggle-seat arranged in alignment with said thrust-yoke, a. pitman arranged between the inner end of said thrust-yoke and said vertically adjustable toggleseat, toggles extending between said thrust-yoke and said adjustable seat and the outer end of said pitman, and a spring exerting pres sure against the thrustyoke.

2. A head motion comprising a thrustyoke, upper and lower thrust-guides, adjustable guide-retainers, an eccentric-shaft ar ranged below the thrust-yoke, a vertically adjustable toggle-seat arranged in alignment with said thrust-yoke, a pitman arranged between the inner end of said thrust-yoke and said vertically adjustable toggle-seat, toggles extending between said thrust-yoke and said adjustable seat and the outer end of said pitman, a casing enclosing said parts, a cover therefor, a tension-spring arranged between one end of said casing and said thrustyoke, and means for varying the tension of said spring.

In testimony whereof I affix my signatuge CHARLES THOMPSON. 

